#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int nx=1e3+5, mod=1e6+7;
ll n, a[nx], h, res, dp[nx][nx];
int main()
{
cin.tie(NULL)->sync_with_stdio(false);
cin>>n;
for (int i=1; i<=n; i++) dp[0][i]=1;
for (int i=1; i<=n; i++) for (int j=1; j<=n; j++) dp[i][j]=(dp[i-1][j]*j+dp[i-1][j+1])%mod;
for (int i=1; i<=n; i++)
{
cin>>a[i];
for (int j=1; j<a[i]; j++) res=(res+dp[n-i][h])%mod;
h=max(h, a[i]);
}
cout<<(res+1)%mod;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
336 KB |
Output is correct |
2 |
Correct |
1 ms |
336 KB |
Output is correct |
3 |
Correct |
1 ms |
336 KB |
Output is correct |
4 |
Correct |
1 ms |
336 KB |
Output is correct |
5 |
Correct |
1 ms |
336 KB |
Output is correct |
6 |
Correct |
1 ms |
336 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
336 KB |
Output is correct |
2 |
Correct |
1 ms |
336 KB |
Output is correct |
3 |
Correct |
1 ms |
336 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
336 KB |
Output is correct |
2 |
Correct |
1 ms |
336 KB |
Output is correct |
3 |
Correct |
1 ms |
336 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
2384 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
2384 KB |
Output is correct |
2 |
Correct |
1 ms |
2396 KB |
Output is correct |
3 |
Correct |
1 ms |
2384 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
4688 KB |
Output is correct |
2 |
Correct |
2 ms |
4564 KB |
Output is correct |
3 |
Correct |
2 ms |
4688 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
8444 KB |
Output is correct |
2 |
Correct |
4 ms |
8272 KB |
Output is correct |
3 |
Correct |
6 ms |
8272 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
27 ms |
16464 KB |
Execution killed with signal 11 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
19 ms |
16464 KB |
Execution killed with signal 11 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
29 ms |
16464 KB |
Execution killed with signal 11 |
2 |
Halted |
0 ms |
0 KB |
- |